In a small bowl, whisk together the fat-free sour cream, brown sugar and liqueur.
In a large bowl, add the halved strawberries and sour cream mixture. Stir gently to mix. Cover and refrigerate until well-chilled, about 1 hour.
Scoop the strawberries into 6 colorful bowls or chilled sherbet glasses. Garnish with whole strawberries and serve immediately.